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[ahy-suh-rith-uh m] /ˈaɪ səˌrɪð əm/

noun, Music.
a structural feature characteristic of the Ars Nova motet, consisting of a single rhythmic phrase pattern repeated, usually in the tenor, throughout the composition.
(music) (of medieval motets) having a cantus firmus that is repeated according to a strict system of internal reiterated note values


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